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<https://github.com/The-OpenROAD-Project/OpenLane/issues/1645|#1645 Missing function on output ports of `sky130_fd_sc_hd__(s)dlclkp_*`>
Issue created by <https://github.com/kareefardi|kareefardi>
*Description*

Output ports of such cells have no function and gets rejected by yosys unless the cells are blackboxed.

*Expected Behavior*

Cells shouldn't be rejected by yosys

*Environment report*

```
n/a
```

*Reproduction material*

n/a

*Relevant log output*

sample output:

```
yosys&gt; read_liberty libs.ref/sky130_fd_sc_hd/lib/sky130_fd_sc_hd__tt_025C_1v80.lib
1. Executing Liberty frontend: libs.ref/sky130_fd_sc_hd/lib/sky130_fd_sc_hd__tt_025C_1v80.lib
ERROR: Missing function on output GCLK of cell sky130_fd_sc_hd__dlclkp_1.
```

Still investigating a proper fix. Related issue: <https://github.com/The-OpenROAD-Project/OpenLane/issues/1627|#1627>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>